Scissors with movable pivot.



G. MANTHEI.

SUISSORS WITH MOVABLE PIVOT.

APPLICATION FILED JUNE 27, 1910. RENEWED MAY a1, 1013.

1,072,] 36, Patented Sept. 2, 1913.

WM/momma: Emmi/Whom COLUMBIA PLANOORAPN c0.. WASHINGTON. D- c.

GUSTAV MANTHEI, OF WISMAR, GERMANY.

SCISSORS WITH MOVABLE PIVOT.

Specification of Letters Patent.

Patented Sept. 2, 1913.

Application filed June 27, 1910, Serial No. 569,160. Renewed May 31,1913. Serial No. 771,114.

To all whom it may concern:

Be it known that I, GUSTAV MAN'rI-Iin, a subject of the King of Prussia,and resident of lVismar, Germany, have invented certain new and usefulImprovements in Scissors with Movable Pivots, of which the following isa specification.

This invention relates to scissors, and more particularly to scissorsfor tailors.

With the scissors of known construction it is much easier to cut thecloth when the scissors are wide open than when the same are opened onlyvery little so that the front ends of the scissors cut the cloth.Therefore it follows that much more force is required to cut with thepoints of the scissors than with their inner cutting edges, or bet terexpressed with the rear parts of the cutting edges. The reason is thatthe leverage of the scissors remains always the same and does not adjustitself automatically according to the degree of opening of the scissors.This inconvenience is overcome by the present invention according towhich the pivot of the scissors blades is movable and arranged in such amanner that it adjusts itself according to the degree of opening of theblades.

In the accompanying drawings the improved scissors are shown by way ofexample.

Figure 1 shows the scissors open and Fig. 2 represents the same closed.

The members a, b of the improved scissors are movably mounted upon thepivot c. The handles of the scissors have each an extension at the outerend upon which the pivots (Z, 6 respectively are fixed. Upon said pivotsd, e the ends of curved levers f are pivotally mounted, whose other endsare pivotally fixed upon the common pivot g which is fixed upon theouter end of a pushing rod h whose other end carries the pivot 0 of themembers a, b. This pivot c is located in longitudinal slots 2' of thescissors members a, 7) in which it can slide.

\Vhen the scissors are being opened, the members a, 0 open at the frontend in turning around the pivot c, which however is pulled toward thehandle as the pivots (Z, c which move laterally with the handles pullthe rod h, so that the pivot c is moved in the slot v, its positionvarying according to the degree of opening of the scissors blades.Therefore it follows that the leverage varies with the degree ofopening, that is to say the lever arm becomes longer the more thescissors are closed and becomes shorter the more the same are opened.

I claim Improved scissors comprising in combination with the bladeshaving longitudinal slots at the center of motion, extensions at theouter end of each handle, pivots upon said extensions, curved leverspivoted at the one end to said pivots, a pushing rod, a pivot at theouter end of said pushing rod upon which the inner ends of said curvedlovers are pivoted and a pivot at the other end of said pushing rodlocated in the 1011- gitudinal slots of the blades and forming thecenter of motion for the same so that this center of motion adjustsitself according to the degree of opening of the scissors, substantiallyas described and shown and for the purpose set forth.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

GUSTAV MANTI-IEI.

Witnesses:

MILLY LIUIrr, EMIL SCHMIDT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, I). G.

